jayanth_rk
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Jan 29, 2020, 6:33 AM
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Help with backlight voltages
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I have an Insignia TV (NS-50DR710NA17) with the power supply board PLTVFY411XAF7. TV works fine, but the backlight is not functioning at all.
The output connector to the LEDs from the power module looks like this: https://i.imgur.com/8i10eMw.jpg
Between the chassis and +VLED, I'm only seeing about +36.5V DC. The -VLEDs show about 34-35V DC when the connector is plugged in. This is definitely too low, right? I could take apart the TV completely to figure out how many LEDs there are, and what the voltage should actually be, but I'd rather avoid that.
Is there anything else on the power supply board I can test with just a multimeter to confirm if it's good or not?
(Followup question, how exactly are the LEDs wired? Seems like the power supply is between the chassis and +VLED, so what are the -VLEDs for?)
Thanks in advance!
(This post was edited by jayanth_rk on Jan 29, 2020, 6:35 AM)
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